Hybrid Adhesives Filled with Functionalized and Non Functionalized Silica Nanoparticles

2018 ◽  
Vol 875 ◽  
pp. 9-13
Author(s):  
José de Jesús Figueroa-Lara ◽  
Miguel Torres-Rodríguez ◽  
Mirella Gutiérrez-Arzaluz
Keyword(s):  
Silica Nanoparticles ◽  
Sol Gel ◽  
Functionalized Silica ◽  
Adhesive Properties ◽  
Chemical Treatments ◽  
Strength Tests ◽  
Gel Technique ◽  
Physical And Chemical ◽  
Zirconia Nanoparticles

Hybrid adhesives epoxy-silica-zirconia were prepared and applied to bond aluminum sheet specimens. Silica nanoparticles were synthesized with the sol-gel “in situ” technique utilizing two different precursors, namely tetraethyl orthosilicate (TEOS) and 3 glycidyloxypropyltrimethoxysilane (GPTMS). Zirconia nanoparticles were prepared also with sol-gel technique and added to the hybrid adhesives before curing. The adhesive properties of the prepared materials were improved after performing several physical and chemical treatments to the aluminium specimens. The best apparent shear strength tests were for the adhesive hybrid materials prepared at 100°C with TEOS.

scholarly journals Synthesis of Silica Nanoparticles by Sol-Gel: Size-Dependent Properties, Surface Modification, and Applications in Silica-Polymer Nanocomposites—A Review

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Ismail Ab Rahman ◽  
Vejayakumaran Padavettan
Keyword(s):  
Surface Modification ◽  
Silica Nanoparticles ◽  
Polymer Nanocomposites ◽  
Sol Gel ◽  
Chemical Properties ◽  
Size Dependent ◽  
Recent Developments ◽  
Gel Technique ◽  
Nanoparticles Characterization ◽  
Physical And Chemical

Application of silica nanoparticles as fillers in the preparation of nanocomposite of polymers has drawn much attention, due to the increased demand for new materials with improved thermal, mechanical, physical, and chemical properties. Recent developments in the synthesis of monodispersed, narrow-size distribution of nanoparticles by sol-gel method provide significant boost to development of silica-polymer nanocomposites. This paper is written by emphasizing on the synthesis of silica nanoparticles, characterization on size-dependent properties, and surface modification for the preparation of homogeneous nanocomposites, generally by sol-gel technique. The effect of nanosilica on the properties of various types of silica-polymer composites is also summarized.

scholarly journals Characterization of in-situ zirconia/mullite composites prepared by sol-gel technique

2021 ◽  
pp. 1-7
Author(s):  
Abdu. I. Abdallah ◽  
M. Sayed ◽  
M. Awaad ◽  
Adam H. E. Yousif ◽  
S.M. Naga
Keyword(s):  
Sol Gel ◽  
Gel Technique

scholarly journals [MG49-LiClO4]:[TiO2-SiO2] Polymer Electrolytes: In Situ Preparation and Characterization

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Oon Lee Kang ◽  
Azizan Ahmad ◽  
Nur Hasyareeda Hassan ◽  
Usman Ali Rana
Keyword(s):  
Polymer Electrolytes ◽  
Structural Changes ◽  
Sol Gel ◽  
Ionic Conductivities ◽  
In Situ Techniques ◽  
In Situ Preparation ◽  
Solution Cast ◽  
Gel Technique ◽  
Cast Technique

In the present research, [MG49-LiClO4]:[HNO3-THF/TiO2-SiO2] and [MG49-LiClO4]:[ClHNO2-THF/TiO2-SiO2] polymer electrolytes were first prepared through simple stepwise in situ techniques: sol-gel technique and solution-cast technique. [MG49-LiClO4]:[HNO3-THF/TiO2-SiO2] and [MG49-LiClO4]:[ClHNO2-THF/TiO2-SiO2] polymer electrolytes were then characterized through different experimental techniques. [MG49-LiClO4]:[HNO3-THF/TiO2-SiO2] and [MG49-LiClO4]:[ClHNO2-THF/TiO2-SiO2] polymer electrolytes had exhibited significant structural changes upon different salt concentrations. In the present investigation, [MG49-LiClO4]:[HNO3-THF/TiO2-SiO2] and [MG49-LiClO4]:[ClHNO2-THF/TiO2-SiO2] polymer electrolytes had attained maximum ionic conductivities (σ~10-7 S/cm at ambient temperature; 10−4 S/cm at 100°C) upon 25 wt.% salt insertion. [MG49-LiClO4]:[HNO3-THF/TiO2-SiO2] and [MG49-LiClO4]:[ClHNO2-THF/TiO2-SiO2] polymer electrolytes had exhibited distinct conduction mechanisms in similar experimental configuration. [MG49-LiClO4]:[HNO3-THF/TiO2-SiO2] and [MG49-LiClO4]:[ClHNO2-THF/TiO2-SiO2] polymer electrolytes had exhibited different stability characteristics over certain operational condition.

Study of structural, electrical, optical and magnetic properties of Hexaferrite–Polyaniline nanocomposites

2019 ◽  
Vol 33 (13) ◽  
pp. 1950134 ◽  
Author(s):  
Muhammad Ajmal ◽  
M. U. Islam
Keyword(s):  
Saturation Magnetization ◽  
In Situ Polymerization ◽  
Sol Gel ◽  
Electric Polarization ◽  
Room Temperature Resistivity ◽  
Magnetic Studies ◽  
Xrd Pattern ◽  
Gel Technique ◽  
Pani Matrix

Y-type hexagonal ferrite (CaBaCo2Ga[Formula: see text]Fe[Formula: see text]O[Formula: see text]) was synthesized by sol–gel technique. The ferrite–polymer composites (1−x)CaBaCo2Ga[Formula: see text]Fe[Formula: see text]O[Formula: see text]+(x)polyaniline (x=0.25, 0.50, 0.75, 1) namely PF1, PF2, PF3 and polyaniline (PANI) were synthesized by in situ polymerization. The synthesized samples were characterized by XRD, SEM, electrical and dielectric measurements, optical and magnetic studies. XRD pattern reveals a broad peak of polyaniline which is an indication of amorphous nature of PANI. Room-temperature resistivity increases from 2.14 × 101 [Formula: see text]cm to 2.78 × 10[Formula: see text]cm as ferrite content increases due to resistive behavior of the ferrite particles dispersed in the PANI matrix. The value of dielectric constant decreases at fixed frequency with increasing concentration of ferrite filler which is predominantly due to exchange of electrons between Fe[Formula: see text] and Fe[Formula: see text] ions that ultimately results in enhancement of electric polarization and conductivity. The optical bandgap increases with increasing amount of ferrite in the composites. The saturation magnetization and remanence increase with the increase of ferrite filler amount in PANI matrix whereas coercivity decreases. The decrease in coercivity and increase in saturation magnetization are related to Brown’s relation. The present nanocomposite samples may be the best candidates for electromagnetic shielding.

Polyamide-6,6/in situ silica hybrid nanocomposites by sol–gel technique: synthesis, characterization and properties

Polymer ◽  
2005 ◽  
Vol 46 (10) ◽  
pp. 3343-3354 ◽  
Author(s):  
Rajatendu Sengupta ◽  
Abhijit Bandyopadhyay ◽  
Sunil Sabharwal ◽  
Tapan K. Chaki ◽  
Anil K. Bhowmick
Keyword(s):  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
In Situ Silica ◽  
Gel Technique ◽  
Silica Hybrid

Designing bijels formed by solvent transfer induced phase separation with functional nanoparticles

Soft Matter ◽  
2019 ◽  
Vol 15 (16) ◽  
pp. 3379-3388 ◽  
Author(s):  
Stephen Boakye-Ansah ◽  
Matthew S. Schwenger ◽  
Martin F. Haase
Keyword(s):  
Surface Modification ◽  
Phase Separation ◽  
Silica Nanoparticles ◽  
Functionalized Silica ◽  
Functional Nanoparticles ◽  
Functionalized Silica Nanoparticles ◽  
Solvent Transfer

Functionalized silica nanoparticles with or without in situ surface modification are used to fabricate bijels via solvent transfer induced phase separation (STrIPS).

Physico-Chemical Properties of Silica Coated Superparamagnetic Magnetite Nanoparticles Synthesized by Non-Seeded Process

2015 ◽  
Vol 1107 ◽  
pp. 267-271
Author(s):  
Sodipo Bashiru Kayode ◽  
Azlan Abdul Aziz
Keyword(s):  
Silica Nanoparticles ◽  
Magnetite Nanoparticles ◽  
Colloidal Suspension ◽  
Sol Gel ◽  
Chemical Properties ◽  
Colloidal Suspensions ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Physico Chemical ◽  
Physical And Chemical

The science of core-shell nanoparticles requires investigation into several physical and chemical properties of the composite nanoparticles. Unlike the conventional sol-gel or the reverse microemulsion micelle method, we presented here a non-seeded process of encapsulating superparamagnetic magnetite nanoparticles (SPMN) with silica. Physico-chemical analysis of the product was used to confirm the result of the coating procedure. Colloidal suspension of SPMN and silica nanoparticles were synthesised through coprecipitation method and modified Stöber method respectively. Afterwards, both colloidal suspensions of SPMN and silica nanoparticles were sonicated to encapsulate the SPMN with silica. Elemental mapping of the composite particles with electron spectroscopy imaging (ESI) confirmed the core-shell micrograph of the SPMN and silica. The X-ray diffraction pattern (XRD) showed the silica shell to be in amorphous form. FTIR analysis further confirmed the chemical properties of the product to be silica coated SPMN.

Preparation and Properties of PVC-Silica Composites using Different Catalysts Via Sol-Gel Process

1999 ◽  
Vol 576 ◽  
Author(s):  
Khan M. Asif ◽  
M.I. Sarwar ◽  
Z. Ahmad
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Sol Gel ◽  
Silica Network ◽  
Transparent Films ◽  
Sol Gel Process ◽  
Gel Technique ◽  
In Situ Generation ◽  
Scanning Electron

Novel micro-composites from Polyvinyl chloride (PVC) and silica were prepared using sol-gel technique. Different catalysts were used for the in-situ generation of silica network from tetraethylorthosilicate (TEOS) in the PVC matrix. Thin transparent films containing various proportions of silica in PVC were cast by the solvent elution technique. Mechanical properties of these films were studied. The results showed an increase in the value of Young's modulus and strain at rupture by the addition of small amount of silica in PVC. However, the stress at yields point and stress at rupture decreased with the addition of silica contents. Scanning electron microscopy (SEM-EDAX) studies were also performed on these samples.

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